Telephony.



PATENTED JULY 14, 1908.

I. KITSEB. TELEPHONY.

APPLIOATION FILED SEPT. 19, 1906.

ISIDOB KITSEE, OF PHILADELPHIA, PENNSYLVANIA.

TELEPHONY.

Specification of Letters Patent.

Patented. July 14, 1908.

Application filed September 19, 1906. Serial No. 335,259.

To all whom it may concern:

Be it known that I, ISIDOR KITSEE, a citizen of the United States, residing at Philadelphia, in the county of Philadelphia and State of Pennsylvania, have invented certain new and useful Improvements in Telephony, of which the following is a specification.

My invention relates to an im rovement in telephony, and has more specia reference to trunk lines ada ted to connect one exchange to a second exc ange.

The drawing represents-in diagrammatic view a trunk line provided with my inven tion.

1 and 2 .are the conductors of the line; A and B are the two centers or exchanges in which said line terminates; in each exchange are similar devices, similarly designated; 3 and 4 represent the jacks; 5 is a contact point normally connecting with the jack-part 4; 7 is an electro-magnet connected with one terminal through wire 6 with point 5 and with the other terminal through wire 8 with the point 9; 10 is a movable switch or key connected through wire 11 with source of current, here shown as a battery 12 grounded at 13. The electro-magnet 7 is provided with the armature 17 18 is a wire connecting the armature 17 with one pole of the source of current 19, the other pole of this source is connected to an annunciating device, here shown as lamp 20, terminating at the point 21.

14 is a second electro-magnet provided with the armature 15, one terminal of the coil of this electro-magnet is connected to the battery 12 and the other terminal is connected to the armature 15.

16 is a. point connected to wire 8. The illustration clearly shows that this electromagnet is connected in shunt to wire 8, point 9, key 10 and wire 11.

The operation of this device is as follows: As long as the ack-part 4 on both stations rests on the point 5, a circuit is established including at each station the grounded source 12 and electro-magnet 7. The coil of this electro-magnet is, therefore, energized and the armature 17 is drawn away from the point 21, thereby making inoperative the circuit including the lamp 20. Normally, also the movable part of the switch or key .10 rests on the point 9, thereby shunting the electro-magnet 14. It is now supposed that the operator at A desires to call-up the operator at B on this particular trunk-line. The operator at A depresses the key 10. Through this depression, the shunt around 14, is broken, and as the electro-magnet 14 is provided with an automatic make and break comprising the armature 15 and point 16, it is obvious that alternately the armature 15 will be drawn towards the core of 14, and when the circuit is thereby broken, it will be released and will contact at 16, this operation, that is, the automatic make and break of the circuit will continue as long as the operator holds thekey 10 away from the point 9. Through this make and break of the grounded circuit, the electro-magnet 7 will e alternately energized and denergized, and the circuit includin the lamp 2.0 will alternately be made and roken. The lamp, therefore, will alternately be lighted and extinguished and this flashing or blinking of the lamp will notify the operator at B that the particular line to which this lamp pertains is wanted. Two ways are now open for the o erator at B to notify the operator at A that c has recognized the signal and is ready for'connection. One is, to de ress his own key whereby a flashing of the amp independent of the former flashing will result, or the operator at B simply inserts a plug in the jack 3 and 4. Through the insertion of this plug, the fore art of the jack 4 will be lowered, thereby the back part raised, and this raising of the back part will disconnect the point 5 from the jack 4; eflfcctually breaking the circuit comprising the two grounded sources 12. Through this breaking of the circuit, the electro-magnet 7 will be entirely deenergized. and the circuit including the lamp 20 will be permanently made at the station A as well as at the station B. The operator at A tells then the o erator at B to what subscriber that particu ar line has to be connected.

As long as one or the other of the plugs remains inserted in the jack, the circuit comrising the batteries 12 is broken and the amp 20 at each of the stations will light. 2 In the systems of to-day, each exchange is provided with, what is called out-going trunk lines and with, what is called incoming trunk lines. This is a necessity, because the operator has no means to-day to find out if a particular trunk line is busy ornot. With my invention, the status of every trunk line,if the same is busy or not-ean easily be ascertained.

The desk of every trunk line operator is provided for each line with an annunciator, such as an incandescent lamp, designated with the same number as the particular trunk line to which it pertains. As long as this lamp remains dark, the particular line is idle and the operator at A as well as B informed of this state, can use the same for out going calls. WVhen, therefore, the operator is required to connect a subscriber of her exchange with a second exchange, she can ascertain at a glance, the status of all the trunk lines connected to her switch board by simply looking at the annunciators of her desk. The trunk line connected to a dark lamp is idle, the trunk line connected to a lighted lamp is busy and the trunk line connected to a lam flashing or blinking is calling-up. t is suggested that these lamps should have a color different from the usual annunciating lamps and a green color is suggested, so as todifferentiate the same from the subscribers lamp.

Where it is desired, trunk lines may also be connected to the common switch board and the operator having in charge the subscribers circuits may also have in chargea certain number of trunk lines and can then connect directly a subscriber calling for a second exchange to the trunk line going to the required exchange.

Having now described my invention, what I claim as new and desire to secure by Letters Patent is:

1. In telephony, means to annunciate the status of a trunk line, comprising a jack conductively connected to the trunk line at each terminal, a local circuit including a source of current and annunciating device for each of said jacks, both of said local circuits being normally closed through said acks, but adapted to be opened through the insertion of a plug in either of said jacks.

2. In combination with a trunk line, connecting two exchanges with each other, means operatively related to the jack of said trunk line to annunciate in each exchange if said line is idle or busy, said means comprising a source of current for the jack in each exchange, both of said sources normally in electrical connection with said trunk line.

3. In combination with a trunk line connecting two telephonic exchanges with each other, a circuit grounding directly through the 'jack in each exchange one leg of said trunk line, a source of current for said circuit, annunciating means for said circuit, said circuit normally made and adapted to be broken through the insertion of a plug in the jack of said trunk line.

4. A telephonic trunk line, jacks therefor, and an annunciating lamp associated with the jacks, in combination with means to produce a continuous lighting of said lamp, and means to produce an intermittent lighting of said lamp, said means embracing a normally closed electric circuit adapted to be broken through the manipulation of one or the other of the jacks.

5. Means to call-up a trunk line operator, said means embracing a grounded circuit, a source of current therefor, an automatic make and break, a shunt for said automatic make and break, and means to open and close said shunt, all operatively related to the trunk line in combination with an annunci ating device operatively related to said grounded circuit.

6. The combination with a telephonic trunk line, of a jack at each terminal thereof, a source of current for each of said jacks normally grounded through the latter, annunciating means for each of said sources, and means dependent on the position of the jacks to change the normal condition of said annunciating means, the aeks being conductively connected to the trunk line.

7. In a telephone system, the combination with a trunk line, and a jack at each terminal thereof, of means to indicate the status of said trunk line including a circuit normally closed through said jacks, said circuit includcontrolled by said circuit, the jacks being conductively connected to the trunk line.

8. In a telephone system, the combination with a trunk line, and a jack at each terminal thereof, of means to indicate the status of said line including a circuit normally grounded through said jacks, a source of current for said circuit, annunciating means controlled by said circuit, a device arranged in said circuit for actuating said annunciating means, and an automatic make-and-break device for said circuit.

9. In a telephone system, the combination with a trunk line, and a ack at each terminal thereof, of means to indicate the status of said line including a circuit normally grounded through said jacks, a source of current for said circuit, annunciating means controlled by said circuit, a device arranged in said circuit for actuating said annunciating means, an automatic make-and-break device for said circuit, and manually-operated means to render said automatic device operative.

10. In telephony, a trunk line connecting annunciating circuit for each of said exchanges, said localized circuit adapted to be made or broken through the operation of the jack pertaining to said trunk line in one or the other of said exchanges, the jacks being conductively connected to the trunk line.

11. The combination with a telephonic l trunk line, of a jack for each terminal thereing a source of current, and an annunciator two exchanges with each other, a localized of, a source of current for each of said jacks normally grounded throu h the latter, annunciating means for eac of said sources, and manually-operated means to cause the annunciating means to intermittently operate, the jacks being conductively connected to the trunk line.

ISIDOR KITSEE.

Witnesses:

EDITH R. STILLEY, MARY 0. SMITH. 

